Class 8 Exam > Class 8 Notes > Short & Long Answer Questions for Class 8 > Very Short Answers - Pollution of Air and Water, Science, Class 8
Very Short Answers - Pollution of Air and Water, Science, Class 8 | Short & Long Answer Questions for Class 8 PDF Download
VERY SHORT ANSWER TYPE QUESTIONS
Q. 1. What is the percentage of nitrogen in atmosphere?
Ans. 78%
Q. 2. What is the percentage of oxygen in atmosphere?
Ans. 21%
Q. 3. Which problem arises by air pollution?
Ans. Respiratory problem
Q. 4. What is smog?
Ans. A thick fog-like layer in the atmosphere is called smog.
Q. 5. Which gases are responsible for acid rain?
Ans. Sulphur dioxide and nitrogen dioxide.
Q. 6. Which gas is responsible for greenhouse effect?
Ans. CO2 (carbon dioxide)
Q. 7. What is global warming?
Ans. Increasing temperature in atmosphere is called global warming.
Q. 8. Which phenomenon causes global warming?
Ans. Greenhouse effect
Q. 9. What is air pollution?
Ans. Addition of pollution in air is called air pollution.
Q . 10. Which gas is responsible for depletion of ozone layer?
Ans. Chlorofluorocarbons (CFCs)
Q . 11. Which fuel are pollution free?
Ans. CNG and LPG
Q . 12. What pollutes Ganga?
Ans. Untreated sewage, dead bodies, garbage, etc.
Q . 13. What do you mean by potable water?
Ans. Water which is suitable for drinking is called potable water.
Q . 14. Which chemical is used to purify water?
Ans. Chlorine
Q . 15. What radiation is absorbed by CO2?
Ans. Infrared radiation
Q . 16. Which rays are harmful for us?
Ans. Ultraviolet rays
Q . 17. Which gas is called greenhouse gas?
Ans. CO2, Methane
Q . 18. What are alternative renewable fuels?
Ans. Solar energy, hydropower and wind energy
Q. 19. What do you mean by ‘Van Mahotsav’?
Ans. When lakhs of trees are planted in July every year, this is called Van Mahotsav.
Q . 20. When was Ganga Action Plan launched?
Ans. In 1985
Q . 21. Name one of the poisonous elements present in the exhaust of automobiles.
Ans. Lead.
The document Very Short Answers - Pollution of Air and Water, Science, Class 8 | Short & Long Answer Questions for Class 8 is a part of the Class 8 Course Short & Long Answer Questions for Class 8.
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FAQs on Very Short Answers - Pollution of Air and Water, Science, Class 8 - Short & Long Answer Questions for Class 8
| 1. What are the main causes of air pollution? |  |
Ans. The main causes of air pollution are industrial emissions, vehicle exhaust, burning of fossil fuels, deforestation, and agricultural activities.
| 2. How does air pollution affect human health? | |
Ans. Air pollution can cause respiratory problems such as asthma, bronchitis, and chronic obstructive pulmonary disease (COPD). It can also lead to cardiovascular diseases, allergies, and even lung cancer.
| 3. What are the consequences of water pollution? | |
Ans. Water pollution can lead to the contamination of drinking water sources, causing various diseases like diarrhea, cholera, and typhoid. It can also harm aquatic life, destroy ecosystems, and disrupt the balance of marine ecosystems.
| 4. How can we prevent air pollution? | |
Ans. To prevent air pollution, we can reduce the use of vehicles and promote public transport, use cleaner energy sources, practice proper waste management, plant trees, and support industries that follow sustainable practices.
| 5. What are the sources of water pollution? | |
Ans. The sources of water pollution include industrial waste, sewage discharge, agricultural runoff, oil spills, and improper disposal of chemicals and waste materials.
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